Nothing serious, I'm just curious.

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: 4a
BCP1: 000000007721167A
BCP2: 0000000000000002
BCP3: 0000000000000000
BCP4: FFFFF880096E3B60
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1

Hello everyone!
O.K so my computer crashed and I'm not sure why. Its not the first time this has happened so it has sparked my interest. It does not happen often enough for it to be a problem but like I said "I'm just curious". If someone could let me know why this is happening I would really appreciate it.
Thanks

You need to follow the Blue Screen of Death (BSOD) Posting Instructions

Well it seems that Avast! is the cause of your BSOD's or at least has been contributing to it.
Please remove and replace with Microsoft Security Essentials to see if it provides more stability. Uninstallers (removal tools) for common antivirus software. Microsoft Security Essentials and Malwarebytes are recommended from a strict BSOD perspective. They do not cause blue screens on the system as other AV products do.

Microsoft Security Essentials, Free antivirus for windows and Malwarebytes Anti-Malware Free

   Information

• Do not start the free trial of MalwareBytes, unselect that option when prompted.
  
  
  
• Update and make full scans with both separately.

Memtest86+

Run Memtest86+ for at least 8-10 passes. It may take up to 20 passes to find problems. Make sure to run it once after the system has been on for a few hours and is warm, and then also run it again when the system has been off for a few hours and is cold. How to Test and Diagnose RAM Issues with Memtest86+

   Note

Pay close attention to part 3 of the tutorial in order to rule the faulty RAM stick out.

   Tip

Do this test overnight.

Let us know the results.